GCD AI RADAR
incidents/AIR-2026-0341

Data Exfiltration via MCP Server Prompt Injection Targeting Cursor

Attack on AI1 Research / proof of conceptPrompt injectionAgent hijackData leak

Researchers showed that a malicious Model Context Protocol server can deliver an indirect prompt injection to the Cursor IDE. This injection tricked the AI agent into executing shell commands to exfiltrate configuration files.

Details

type
Attack on AI
An AI model, agent or AI-powered product was the thing exploited, abused or leaked.
categories
  • Prompt injectionprimary
    Untrusted content (web pages, documents, emails, tool output) steers a model into ignoring its instructions.
  • Agent hijack
    An AI agent is tricked into unauthorized actions: tool misuse, data exfiltration through the agent, or acting against its principal.
  • Data leak
    Training data, chat logs, system prompts, model weights or other AI-system data exposed.
owasp llm top 10
mitre atlas
Both rows are derived from the type and categories (OWASP 2025 edition, ATLAS release 2026.09), not classified per record. How
severity
1 · Research / proof of concept
Demonstrated by researchers; no known real-world exploitation.
targets
Framework / tooling, Enterprise deployment
products
Cursor, Model Context Protocol
incident date
24 Jun 2025
first reported
30 Jan 2026
origin
MITRE ATLAS
Derived from MITRE ATLAS (Apache 2.0, © MITRE).
classifier confidence
0.95 · published at or above 0.80; see the methodology
tags
mcp · prompt_injection · cursor · data_leak
record
created 2026-10-18 06:55Z · updated 2026-10-18 06:55Z · json

Sources · 2

  1. 2026-01-30
    Data Exfiltration via an MCP Server used by Cursor
    MITRE ATLAS · atlas.mitre.org/studies/AML.CS0045
  2. 2026-01-30
    Simulating a Context-Poisoning Vulnerable MCP Server: A POC
    backslash.security · backslash.security/blog/simulating-a-vulnerable-mcp-server-for-context-poisoning

Titles and links belong to their publishers. The summary above is written by GCD AI RADAR in its own words; data is CC BY-SA 4.0.

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